At what point does there become pressure to deliver though? We said the same about Klopp early on but I think we would've seen pressure build if nothing substantial (trophies) had been delivered. Even now Klopp is questioned because of the volume of success.
Arteta does eventually need to deliver a title. I understand your point of view though. When you haven't been good for a while, having a competent manager and a feel good factor is a nice feeling.
Actually no, I dont think Arteta needs to deliver anything other than consistent top 4 qualification, CL participation and increasing the reach of the club around the world in doing so. At least from an internal metrics perspective.
What the fans want and what the club deem important are two different things.
This is why you would have never fired Klopp even if you won nothing substantial again. Klopp made Liverpool relevant again after many years of mediocrity, and that return to consistency at the top level is what has bought him the trust that he has had over the years.
Here is the key bit, I'd say though...
Arteta has the ability to keep Arsenal competing at the top and Arsenal hold him to that. But Arsenal also see the potential of Arteta to win the big prizes too, and that further strengthens their case of holding onto him and giving him time and space to deliver. The club know that they have struck gold with Arteta and are ready to give him the support he needs, within the club's means of course, to realise that potential.